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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Period for credit risk identified |  | 30 days |
Sales revenues totaling | $ 7.1 | $ 15.6 |
Lease revenue | 100.7 | 300.8 |
Operating lease revenue | 100.0 | 299.0 |
Finance lease revenue | 0.7 | 1.8 |
Finance lease revenue, sales revenue |  | 1.7 |
Finance lease revenue, interest income |  | $ 0.2 |
Period for warranties for rental equipment |  | 90 days |
Period for warranties for equipment manufactured |  | 1 year |
Deferred Income [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Customer contract liability | 20.7 | $ 20.7 | $ 17.5
Accounts Receivable [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Unbilled contract assets | $ 0.4 | $ 0.4 | $ 1.0

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